Valve bag



Aug. 18, 1931. c. G. KRONMILLER VALVE BAG Filed June 30, 1928OIOIUOQOOOQGO Gun.

gwmzntoz Carl G. Kronrnillen M OLWZQA Patented Aug. 18, 1931 UNITEDSTATES PATENT orrlcr.

CARL G. KRONMILLER, OI CHICAGO, ILLINOIS, ASSIGNOR, BY MESNEASSIGNMENTS, 4

TO ST. BEGIS PAPER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF NEWYORK VALVE BAG Application filed June 30,

This invention relates to valve bags and more specificallyto a gussetedvalve bag having a supplemental flap attached for forming the valve.Details of the invention will appear as the description proceeds.

In the accompanying drawings forming a part of this specification,Figure 1 is a view of an end of a bag partly broken away to show theconstruction of the valve forming one embodiment of this invention; Fi 2is a similar view. showing a slightly di erent embodiment of theinvention.

In the construction shown, there is indicated one end of a tubular bagbody 10 having a gusset fold 11 in its side. The end of th apex ofthe-gusset fold is bent downward and outward, as shown at 12, the sidesof the gusset fold being folded along diagonal lines on the twoside'sfrom the apex of the gusset fold to the corner of the bag wherethe edges of the gusset fold reach the end of the bag. One of these foldlines is indicated on Fig. 1 by dotted line, 13. Preferably this foldline is at so that the edge of the gusset fold which originally lay evenwith the end of the bag is folded down to lie even with the edge of thebag as clearly appears in Fig. 1.

In order to form a valve flap, a sheet of flexible material 14 isapplied to the bent down portion of the gusset fold. In the form shownin Fig. 1, the end 15 of the sheet 14 is bent over the outer edge of thefolded down portion 12 and is adhered thereto where it contacts theouter side of the bag wall at 16.

In the form disclosed, the end of the bag is closed by folding thereovera reinforcing tape 17 which is sewed to the bag by an end closing seam1,8. This seam passes through the edges of sheet 14.

I The construction shown in Fig. 2 is similar to that shown in Fig. 1,except that the edge of the valve sheet 14 is not bent over the edge ofthe bent down portion of the bag wall, but is adhered thereto along line16'.

In formin valves in bags having gusseted folds, it has lieen customaryto cut the valve with an extension at the valve corner and then fold theend of the gusset first outward and then inward in the manner disclosedin the patent to Bates, Door and Dancker, No.

1928. Serial No. 289,344.

1,682,107, issued August 28, 1928. By inserting the valve sheet 14, thenecessity of cutting the tube with an extension at the valve corner isavoided. This results in a simplification of the cutting operation asWell as in a saving of paper. The invention is particularly adapted fora paper bag formed of a plurality of layers of paper, such asillustrated in the drawings, but is also adapted to single wall paperbags if desired. Sheet 14 or 14 of more flexible material than the wallsof the bag. It may be of flexible paper, such as crepe paper, butpreferably is of cloth. The flexibility of the sheet causes it to closethe valve completely and securely.

Ordinarily, it is preferable to sew the valve sheet into the seam asdisclosed. It will be readily understood that when the bag is filled andthe gusset fold is s read apart and straightened out along the ody ofthe bag, the upper end of the gusset fold, where the walls of the bagare held together by the seam might project outward to such an extentthat there would be a considerable discharge spout if it were not forsheet 14. The distance between the inner corner 19 of sheet 14 where itis caught in the seam and the middle outer ortion 20 where it isattached to the apex o the gusset fold is greater than that betweencorner 19 and corners 21 where the outer upper corners of the fiaparecaught in the seam, because the distance from 19 to 20 is along adiagonal line. However, this difference is not nearly so great as thedistance between 21 and 20 and, therefore, when the sheet is caught inthe end of the bag at corner 19 it prevents the bag walls along thegusset fold from projecting outward as far as they otherwise might and,therefore, reduces the opening at the corner of the bag which must beclosed by the valve flap.

While preferred forms of construction have been disclosed quitespecifically, it will be understood that various departures may be ispreferably made from the precise form shown and described within theterms of the appended claims.

What is claimed is:

1. A valve bag comprising a body portion cut square across its end andhaving a gusset fold in its side, the apex of the fold being foldeddownward and outward at one end, and a sheet of material having one endattached to the end of the gusset fold where fold in its side, the apexof the fold being I folded downward and outward at one end, a sheet ofmaterial having one end attached to the end of the gusset fold where itis folded outward and having its other end extending inward, and a seamsewed across the end of said body portion and through the edges of saidsheet.

3. A valve bag comprising a body portion cut square across its end andhaving a gusset fold in' its side, the apex of the fold bein foldeddownward and outward at one en and a sheet of material having one endattached to the end of the gusset fold which is folded outward andhaving its other end extendin inward, the sheet being free from the wall0 the bag throughout the greater portion of its length on the sidefarthest from the end of the bag.

4. A valve bag comprising a body portion of comparatively stiff materialand out square across its end and having a gusset fold in its side, theapex of the fold being folded downward and outward at 'one end, and asheet of comparatively flexible material having one end attached to theoutwardly folded portion of the gusset fold and having its other endextending inwardly.

5. A valve bag comprising a body portion of paper and cut square acrossits end and having a gussetfold in its side, the apex of the fold beingfolded downward and outward at one end, and a sheet of cloth having oneend attached to the outwardly folded portion of the gusset fold andhaving its other end extending inwardly.

6. A valve bag comprising a body portion formed from a plurality oflayers of paper and cut square across its end and having a gusset foldin its side, the apex of the fold being folded downward and outward atone end and a sheet of material having one end folded over the edges ofthe bag walls where the are bent outward and downward, and attac ed tosaid walls, the other end of the sheet extending inward.

7. A'valve bag comprising a body portion of paper out square across itsend and having a gusset fold in its side, the apex of the fold beingfolded downward and outward at one end so that said apex isperpendicular to its original position and the edges forming the end ofthe gusset fold lie substantial- 1y even with the edges of said-gussetfold, a sheet having one end attached to the edge of the downwardlyfolded ortion of the gusset fold and having its 0t er end extendingaeraeaa inward, and

the bag and through the edges of said sheet.

In testimony whereof l have hereunto signed my na a body portion me tothis specification.

CARL G. KRONMILLER.

